Note 14 - Stock Option Plans (Tables)
 6 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
For the Three Months Ended March 31,
  
   
20
20
    
201
9
  
   
Number
Of
Shares
    
Weighted
Average
Exercise
Price
    
Number
of
Shares
    
Weighted
Average
Exercise
Price
  
Outstanding options at the beginning of period
    
670,167
     $
8.19
      
728,533
     $
8.17
  
Options exercised
    
—
      
 
      
—
      
 
  
Options forfeited/cancelled
    
(3,300
)
    
8.21
      
(1,766
)
    
8.21
  
Outstanding options at the end of period
    
666,867
     $
8.19
      
726,767
     $
8.17
  
Exercisable options at the end of period
    
666,867
     $
8.19
      
726,767
     $
8.17
  
   
For the Six Months Ended March 31,
  
   
20
20
    
201
9
  
   
Number
Of
Shares
    
Weighted
Average
Exercise
Price
    
Number
of
Shares
    
Weighted
Average
Exercise
Price
  
Outstanding options at the beginning of period
    
722,567
     $
8.18
      
728,867
     $
8.17
  
Options exercised
    
—
      
—
      
—
      
—
  
Options forfeited/cancelled
    
(55,700
)
    
8.08
      
(2,100
)
    
8.17
  
Outstanding options at the end of period
    
666,867
     $
8.19
      
726,767
     $
8.17
  
Exercisable options at the end of period
    
666,867
     $
8.19
      
726,767
     $
8.17
  
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
 
 
 
  
Options Outstanding
    
Options Exercisable
  
Range of Exercise Price
  
Number
of Shares
Outstanding
    
Weighted
Remaining
Contractual
Life (in
Years)
    
Weighted
Average
Exercise
Price
    
Number
of Shares
Exercisable
    
Weighted
Average
Exercise
Price
  
$5.7501
-
$8.6250
    
557,367
      
2.4
     $
7.96
      
557,367
     $
7.96
  
$8.6251
-
$11.5000
    
109,500
      
2.8
      
9.37
      
109,500
      
9.37
  
                                             
 
 
 
    
666,867
      
2.5
     $
8.19
      
666,867
     $
8.19